Type: HF Tx/Rx system with intercom amp for vehicle crews.

Frequency range: 2 - 16 MHz in 3 bands.

Modes: AM R/T, CW, FSK.

Tx output: HP: 45W; LP: 3-10W

Aerials: vertical 8 - 16' rods; long wires, dipoles.

Power supply: a) 'SUTR 24V': 24 volt DC input, 22A send, 6A receive, from lead-acid batteries. b) 'SUR No.30': 100 - 240 V AC input for ground stations.

Major components: C11 Tx, R210 Rx, power supply, ATU No.7, J1 control box.

Circuitry: C11 Tx uses 14 valves. On AM, high level anode and screen modulation is used. The R210 Rx is 15-valve, single conversion superhet with a 460 KHz IF.

Variants: the C11SSB/R210M added a USB mode with discrete 1KHz steps. Using early semiconductors and plug-in cards, it is well known for unreliability.

Usage: introduced in the 1960's, as a replacement for the WS No.52, in ground and vehicle stations.

Notes: This is highly usable HF transceiver, with good stable VFOs in both Tx and Rx. Indeed the sets are beautifully made, and a pleasure to work on (unlike the WS19!) as they incorporate hinged chassis to improve access. The Tx has enough power to make AM reasonable on 80m, though the R210 IF bandwidth is perhaps somewhat wide for modern conditions. The R210 does have an excellent "film scale" type frequency display, allowing good tuning repeatability. Both Tx and Rx have crystal calibrators built in.